They are all 4-9 years old now. Many need some suspension work. Rod bearings are a good idea for the risk adverse. Batteries often last only 4 years. Rear tires may last only 12k miles. Throttle actuators tend to last about 5 years. Fuel pressure sensor may fail. Overall, I think the car is very reliable for a high performance cars. I have an 08 E90 with 82k, had it for 6 years and 50k.

I have an E92 M3 09 80k miles. Idle control valve had to be replaced but it was under warranty. Other than that no problems at all. Haven't had my rod bearings replaced. It's a solid car in my opinion. Really buttoned down. When I wanna hear lots of woosh noises and complain about drone I drive my Evo lol.

Depending on miles: Throttle body actuators @ 60K+ miles (check for wear on the plastic gears, you can rebuild them yourself for a fraction of the cost it takes to replace them, very easy process), Idle Air controller (look for idle hunting and low engine load limp mode), O2's tend to go at higher mileages 80K+, rod bearings are a big deal on these i'd look for one that had them done already, valve cover gasket will start leaking upwards of 60K(also very easy to DIY), anything with 50K+ look to change: diff fluid, brake, coolant, trans fluid (if manual check on the trans filter as well, spark plugs, and engine oil of course. Check for wear on the suspension, more than likely the end links will go first, check engine mounts...i've seen them destroyed at upwards of 50-60K they just aren't that heavy duty considering it's supposed to be more for comfort so the mounts are soft and are worn easily. I just picked up my 08 M3 with the RS46 stroker, I just did a plethora of maintenance, and I gotta say wrenching on this car is not bad at all. I've done everything DIY on this vehicle and will continue to do so. I also recommend you either get a warranty if you aren't down with the DIY, or if you are there are lots of good resources on how to do just about anything on this vehicle. In the end of the day the car is a dream to drive (especially the 6-speed manual), and if you opt for supercharger later on you can get rid of the lack of torque on the bottom and mid range due to the high revving small displacement flat plane V8. Other than that the S65 is rock solid and there's a guy (RDDC) on youtube that has one with 208K miles on it running strong! It's all about the maintenance and whether you are willing to do pay the price to play. That's also another reason to DIY everything, cheaper and it's amazing seeing some of the cool technology and thought put into this mechanical beast. One of the most advanced engines of it's time. Good luck.

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